It seems to start in MAN each morning, doing MAN-CBG-GOT early and the reverse late-afternoon/evening. Presumably no expectation for the SE based people to do day trips whereas the UK based lot could. That's certainly the pattern I remember when I was CBG based and looked on the off chance. The commercially available fares were pretty ruinous at the time though, so I can't imagine anyone not flying OPM was taking them up on that offer.